dissimulator
dissembler
phoney
phony
hypocrite
pretender
flat-earther
Nicodemite
crypto-believer
honey badger
apologist
vindicator
justifier
ultracrepidarian
slicker
cheater
deceiver
cheat
trickster
beguiler
sheeple
heretic
philodoxer
nonbeliever
errorist
apistevist
dreamer
sphinx
God botherer
faultfinder
anythingarian
cynic
exclusionist
misbeliever
infidel
sentiocentrist
suppressionist
discount
antisceptic
freethinker
skeptic
solipsist
attestant
attester
dissuasion
-ist
do-gooder
doubting Thomas
not that there's anything wrong with that
evidentialist
mythoclast
dissemble
advocate
irrationalist
U-turner
unbelievably
upholder
chud
know-it-all
know-all
-er
relativist
postulator
doubter
show one's true stripes
miscreant
sceptic
nonsense
pro
distruster
adherent
contemplative
anti
free spirit
take a stand
creditor
disciple
rightist
munafiq
non-player character
ideologue
pragmatist
sympathizer
win around
believer
broad-minded
voice in the wilderness
nonphilosopher
alethophobia
doctrinaire
put one's cards on the table
hot gospeller
come-outer